[A] The opinion that birds were the direct descendants of dinosaurs gives the world a shock. [A]鸟类是恐龙直接后裔,这个观点让世界很震惊。 [B] Palaeontologists have get consensus on the specie’s transition from the land to the sky. [B]古生物学家就该物种从地上到空中的转化这个问题上达成了...
The 72,000,000-year-old bones of a baby dinosaur have given scientists added proof that birds may be the direct descendants of dinosaurs. The presence of growth plates--discs of cartilage that occur near the ends of long bones and enable bones to grow in length-in dinosaur fossils not ...
"The door just opens up to a whole avenue of research that involves anything extinct," said Matthew T. Carrano, curator of dinosaurs at the Smithsonian's National Museum of Natural History. The new finding adds weight to the idea that today's birds are descendants of dinosaurs. While dinosau...
B. If birds are in fact the descendants of dinosaurs, then it can be argued that the dinosaurs never really died out. C. Flying dinosaurs such as the Pteranodon, which is not thought to have been related to modern birds, do not appear to have had feathers. D. Soft tissues such as sk...
Paul argues provocatively for the idea that the ancestor-descendant relationship between the dinosaurs and birds can on occasion be reversed, and that many dinosaurs were secondarily flightless descendants of creatures we would regard as birds. Controversial and comprehensive, Dinosaurs of the Air also ...
The clade Neornithes includes the avian crown group, which comprises all living birds and the descendants from their most recent common maniraptoran ancestor. One well-known and important fossil of an animal that appears “intermediate” between dinosaurs and birds is Archaeopteryx ((Figure)), wh...
All birds are dinosaurs, but not all dinosaurs are birds; a small group of dinosaurs evolved into birds that coexisted with other dinosaurs for 90 million years. Modern birds are the descendants of the group of birds that survived the extinction that killed the rest of the dinosaurs,...
Although it can be hard to imagine that a peacock and a crocodile have much of anything in common, these animals are actually descendants of the same prehistoric vertebrates. Birds are thought to have...
Under this system, organisms are grouped into "clades," which are distinct branches on the phylogenetic tree that include all the descendants of a most recent shared ancestor. For example, modern birds are grouped into the Neornithes clade, because they all emerged from a common Neornithine an...
Paleontologists agree that birds are the direct descendants of dinosaurs. So why aren't any modern-day birds the size of T. Rex or Apatosaurus?